Missing features from QT version (implemented on Win32 version)
- PBuffer accelerated Offscreen rendering
- Customize QFileDialog (integrate Snapshot Settings). Not supported under Qt4.x
- Customization of toolbar buttons

QT4 known bugs
- repaint problem during model loading (paintEvent) bug ID 79310
- toggle buttons on toolbar not work (toggle signal is not received, 
  bug reported to Trolltech, bug ID 80931)
- Open Dialog (bug ID 75699) 
    a) does not display directories if the name does not match against filter
    b) could not change directory which does not contain filter matching file
    c) only parent directory is listed
- Toolbar buttons initial status is always inactive, does not reflect 
  the real, stored status (bug id 91403)

Known Issues with LDView/Qt:
- Save Snapshot generates corrupted image if Memory Usage is set to 
  Medium or High
- If size of snapshot is bigger than the window size the snapshot is
  splited into tiles. In some cases these tiles are corrupted
- Some times changing of step state does not take affect
- When Xserver is running as non-root and LDView runs as root icons and
  menu bar are not displayed with Qt 4.x. Workaround run as non-root user
  set QT_X11_NO_MITSHM=1 or build with Qt 5.x.

Last updated:
10/24/2015
